c# socket 客户端异步实现

简易封装：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Net;using System.Net.Sockets;namespace dclient{    public delegate void DelegateMsg(object msg);    public class Client    {        private static Socket _clientSocket;        private static string _server;        private static int _port;        public static DelegateMsg OnConnect;        public static DelegateMsg OnSend;        public static DelegateMsg OnReceive;        public static DelegateMsg OnServerDown;        public static DelegateMsg OnErr;        public static void Connect()        {            try            {                _server = System.Configuration.ConfigurationManager.AppSettings["serverIp"];                _port = int.Parse(System.Configuration.ConfigurationManager.AppSettings["serverPort"]);                IPEndPoint ip = new IPEndPoint(IPAddress.Parse(_server), _port);                _clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);                _clientSocket.BeginConnect(ip, new AsyncCallback(ConnectCallBack), _clientSocket);            }            catch (Exception e)            {                throw e;            }        }        private static void ConnectCallBack(IAsyncResult iar)        {            Socket client = (Socket)iar.AsyncState;            try            {                client.EndConnect(iar);                OnConnect("已连接");            }            catch (SocketException e)            {                if (e.ErrorCode == 10061)                {                    OnErr("服务器程序未运行或服务器端口未开放");                }                else                {                    OnErr(e.Message);                }            }            finally            {            }        }        public static void Send(string msg)        {            if (_clientSocket == null || msg == string.Empty) return;            msg += "\r\n";            byte[] data = Encoding.UTF8.GetBytes(msg);            try            {                _clientSocket.BeginSend(data, 0, data.Length, SocketFlags.None, asyncResult =>                {                    int length = _clientSocket.EndSend(asyncResult);                    OnSend(string.Format("客户端发送消息:{0}", msg));                }, null);            }            catch (Exception e)            {                OnErr(e.Message);            }        }        public static void Recive()        {            byte[] data = new byte[1024];            try            {                _clientSocket.BeginReceive(data, 0, data.Length, SocketFlags.None,                asyncResult =>                {                    try                    {                        int length = _clientSocket.EndReceive(asyncResult);                        OnReceive(string.Format("收到服务器消息:长度：{1},{0}", Encoding.UTF8.GetString(data), length));                        Recive();                    }                    catch (SocketException e)                    {                        if (e.ErrorCode == 10054)                        {                            OnServerDown("服务器已断线");                        }                        else                        {                            OnErr(e.Message);                        }                    }                }, null);            }            catch (Exception ex)            {                OnErr(ex.Message);            }        }    }}

使用：

  public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();            Client.OnConnect += new DelegateMsg(connect);            Client.OnSend += new DelegateMsg(send);            Client.OnReceive += new DelegateMsg(receive);            Client.OnServerDown += new DelegateMsg(svrdown);            Client.OnErr += new DelegateMsg(onerr);        }        private void Form1_Load(object sender, EventArgs e)        {            Client.Connect();        }        private void connect(object msg)        {            System.Diagnostics.Debug.WriteLine(msg.ToString());            Client.Send("DALO 发送测试");            Client.Recive();        }        private void send(object msg)        {            System.Diagnostics.Debug.WriteLine(msg.ToString());        }        private void receive(object msg)        {            System.Diagnostics.Debug.WriteLine(msg.ToString());        }        private void svrdown(object msg)        {            System.Diagnostics.Debug.WriteLine(msg.ToString());        }        private void onerr(object msg)        {            System.Diagnostics.Debug.WriteLine(msg.ToString());        }    }

未实现的几个常用操作：
1、接收服务器发送的大数据量的合包。
2、服务器断线后客户端自动检测并重连，需先将_clientSocket释放。
3、心跳包。